DOKK / manpages / debian 11 / openmpi-doc / shmem_barrier_all.openmpi.3.en
SHMEM_BARRIER_ALL(3) Open MPI SHMEM_BARRIER_ALL(3)

shmem_barrier_all - Suspends the execution of the calling PE until all other PEs issue a call to this particular shmem_barrier_all() statement.

C or C++:

#include <mpp/shmem.h>
void shmem_barrier_all(void);

Fortran:

include 'mpp/shmem.h'
CALL SHMEM_BARRIER_ALL

The shmem_barrier_all routine does not return until all other PEs have entered this routine at the same point of the execution path.

Prior to synchronizing with other PEs, shmem_barrier_all ensures completion of all previously issued local memory stores and remote memory updates issued via SHMEM functions such as shmem_put32(3).

setup_data()
{

if (shmem_my_pe() == 0) {
setup();
}
/* All PEs wait for PE 0 to complete setup(). */
shmem_barrier_all(); }

shmem_barrier(3), shmem_init(3)

December 18, 2020 4.1.0